KR20070098579A - Surge absorber - Google Patents

Abstract

A surge absorber is provided to change a distance between discharge electrodes without changing a length of a discharge electrode by varying a relative position between a pair of protrusion electrodes. A surge absorber includes an insulation tube. A gas is sealed inside the insulation tube. A pair of terminal electrode members(2,3) are arranged at both ends of the insulation tube. A pair of protrusion electrodes(5,6) are fixed on an inner surface of one of the terminal electrode members, such that the protrusion electrodes are arranged to be protruded toward the other terminal electrode member. The protrusion electrodes are arranged to be offset from facing positions. The protrusion electrodes are arranged to be point-symmetric with respect to a center of the insulation tube.

Description

Surge Absorber {SURGE ABSORBER}

1 is an axial sectional view showing a surge absorber according to a first embodiment of the present invention.

2 is an axial sectional view showing a surge absorber according to a second embodiment of the present invention.

Fig. 3 is an axial sectional view showing a surge absorber whose length of the protruding electrode is equal to half of the distance between the terminal electrode members;

4 is an axial sectional view showing a surge absorber according to the third embodiment of the present invention.

5 is a perspective view showing an example of a protruding electrode.

6A to 6E are longitudinal cross-sectional views showing the fixing method of the protruding electrodes in the order of process.

7 (a) to 7 (c) are longitudinal sectional views showing another fixing method of the protruding electrodes in the order of process.

Fig. 8 is an axial sectional view showing a surge absorber in which a conductive coating is formed on a protruding electrode.

Fig. 9 is a graph showing the response voltage characteristics between forming a conductive coating on the protruding electrode and not forming it.

Fig. 10 is a longitudinal sectional view of a surge absorber according to a fourth embodiment of the present invention.

Fig. 11 is a longitudinal sectional view of a surge absorber according to a fifth embodiment of the present invention.

12 is a longitudinal sectional view of a surge absorber according to a sixth embodiment of the present invention.

13 is a cross sectional view of a discharge electrode according to the embodiment of FIG. 12;

14 is a graph showing the response voltage characteristics of the discharge electrode and the conventional discharge electrode according to the present invention.

15 is a longitudinal sectional view of a conventional surge absorber.

<Explanation of symbols for main parts of the drawings>

1: surge absorber

2, 3: terminal electrode member

4: ceramic insulator tube

5, 6: protruding electrode

7: metallization layer

8: soldering material

51: trigger gap

[Document 1] Japanese Unexamined Patent Publication No. 2005-63721

[Document 2] Japanese Unexamined Patent Publication No. 6-132065

The present invention relates to a surge absorber used to protect various devices from abnormal voltages (surge voltages) and to prevent accidents in advance. This surge absorber is used, for example, for surge countermeasures and static electricity countermeasures of various electronic devices or various devices configured by assembling electronic devices.

This application is Japanese Patent Application No. 2006-89955, filed March 29, 2006, Japanese Patent Application No. 2006-336882, filed December 14, 2006, and Japanese Patent Application, Dec. 28, 2006 Priority is claimed on application 2006-356115, the contents of which are incorporated herein.

To the surge voltage such as lightning surge or static electricity such as the part where electronic device for communication equipment such as telephone, facsimile, modem, etc. is connected with communication line, the part where electronic device is connected to power line, antenna or CRT driving circuit The surge absorber is connected to a portion which is susceptible to electric shock due to thermal damage or ignition of an electronic device or a printed circuit board on which the device is mounted due to an abnormal voltage.

With the recent trend of high-density packaging in electronic devices, it is required to reduce the size of the discharge surge surge absorber for communication lines and power lines to form surface-mounted parts. A surge absorber capable of miniaturization and surface mounting in which a sealing electrode is formed convex is proposed (see, for example, Japanese Unexamined Patent Application Publication No. 2005-63721).

In such a surge absorber, it is necessary to change the distance between electrodes in order to adjust the discharge start voltage without changing the electrode material, the sealing gas, and the sealing gas pressure.

However, in the surge absorber described in the above document, in order to change the distance between the electrodes, it is necessary to change the length of the discharge electrode, and there is a problem that a manufacturing cost such as manufacturing a mold is required each time.

Moreover, conventionally, this kind of surge absorber is comprised with a pair of discharge electrode arrange | positioned holding the predetermined | prescribed discharge gap in the airtight container which has a predetermined volume (Japanese Unexamined-Japanese-Patent No. 6-132065). .

Fig. 15 shows an example of a conventional surge absorber. In this surge absorber S, a pair of lead wires 301a, 301b are provided in the base 300 made of an electrical insulating material to pass through the airtight type at a predetermined interval. At one end of the pair of lead wires 301a, 301b, discharge electrodes 302a, 302b made of iron (Fe), nickel (Ni), copper (Cu), or an alloy thereof are provided in parallel. An airtight container member 303 made of an electrical insulating material such as glass is provided in the base 300 so as to surround the discharge electrodes 302a and 302b. In the hermetic container member 303, a discharge gas made of an inert gas such as argon (Ar) or nitrogen (N) gas is filled.

In the surge absorber S having the above configuration, the lead wires 301a and 301b are connected between the lines of the device to be protected, for example, between the lines of the electronic device. When a surge is applied to the line, an air discharge is generated between the discharge electrodes 302a and 302b, the surge is absorbed, and the electronic device is protected from the surge.

However, in the above-described surge absorber S, it is difficult to obtain a stable discharge start voltage, and there is a possibility that the discharge start voltage rises when a steep surge is applied, and the function as a surge absorber may not be sufficiently fulfilled.

An object of the present invention is to provide a surge absorber capable of easily changing the distance between discharge electrodes without changing the length of the discharge electrode.

Moreover, this invention is made | formed in order to solve the said fault, The objective is to provide the surge absorber which can obtain the stable high-precision discharge start voltage, and can ensure the function as a surge absorber.

MEANS TO SOLVE THE PROBLEM In order to solve the said subject, this invention provides the following means.

The surge absorber according to the present invention includes an insulating tube for disposing a pair of terminal electrode members at both ends and sealing a sealing gas therein, and the other terminal electrode member is disposed on an inner surface of the pair of terminal electrode members. A pair of protruding electrodes protruding toward each other is fixed, and the pair of protruding electrodes is shifted from an opposite position.

If the pair of protruding electrodes fixed to the inner surface of the pair of terminal electrode members so as to protrude in the axial direction and the inner side of the insulating tube are arranged so as to be displaced from the opposite positions, the displacement of the protruding electrode The distance between the protruding electrodes can be easily changed without changing the length.

In this surge absorber, it is preferable that the pair of protruding electrodes are arranged at a point symmetrical position with respect to the center of the insulating tube.

In this case, since the trigger gap formed between the pair of protruding electrodes is formed near the center of the insulating tube, the discharge start voltage can be stabilized.

In this surge absorber, it is preferable that the distance from the front end to the base end of the pair of protruding electrodes is equal to half or less than half of the distance between the pair of electrode members.

If the distance from the leading end of the pair of protruding electrodes to the proximal end is equal to or less than half of the distance between the pair of electrode members, the lifespan characteristics can be improved.

In this surge absorber, it is preferable that the pair of protruding electrodes are formed spirally.

If the shape of the pair of protruding electrodes is formed spirally, the length from the proximal end to the distal end of the protruding electrode can be large, so that the fixing material rises up to the proximal end of the protruding electrode by surface tension when the protruding electrode is fixed to the terminal electrode member. It is possible to prevent the characteristics of the electrode material from changing.

Moreover, in this surge absorber, responsiveness can be greatly improved by forming a film containing silver on the outer surface of the protruding electrode, and in particular, even when a steep surge is applied, an increase in discharge start voltage is suppressed. Thus, a stable discharge start voltage can be obtained.

Moreover, you may fix the said protruding electrode by caulking a base end part in the hole formed in the said terminal electrode member.

If the protruding electrode is firmly fixed to the terminal electrode member by caulking, the protruding electrode is bent or the protruding electrode fixed from the terminal electrode member is pulled out by a thermal shock such as repeated discharge or an impact such as vibration from the outside. No change can be prevented in the discharge distance.

In the surge absorber according to the present invention, a pair of rod-shaped discharge electrodes are arranged in parallel to each other while maintaining a predetermined discharge gap in the airtight container, and the pair of discharge electrodes face each other through at least the discharge gap. Towards the inward side of the material is characterized in that it contains Ag or Ag alloy.

In the surge absorber having the above-described configuration, discharge is performed between a pair of discharge electrodes made of Ag or Ag alloy having a stable discharge start voltage, so that the surge is absorbed. For this reason, the start voltage of the discharge is performed within a stable range within a predetermined range. In addition, since the discharge is performed between the inward side surfaces of the rod-shaped discharge electrodes parallel to each other, the discharge surface can be secured widely in the longitudinal direction of the discharge electrode, and stable discharge can be performed.

The surge absorber according to the present invention can secure a wide discharge area by at least the inward side facing each other through at least a discharge gap of a pair of rod-shaped discharge electrodes parallel to each other, and at the same time, Ag or Since the Ag alloy is contained, the discharge start voltage is performed within a stable range, and even when a steep surge is applied, the discharge start voltage does not increase and the function as a surge absorber can be ensured.

In this case, not only the inward side surface of a pair of discharge electrodes, but the whole surface may be comprised from Ag or Ag alloy.

In the case where the entire surface is made of Ag or Ag alloy, the entire pair of discharge electrodes may be made of Ag or Ag alloy, or may be made of a structure in which a coating layer made of Ag or Ag alloy is formed.

In the surge absorber having these configurations, since a large area of the surface is composed of Ag or Ag alloy, more stable discharge is performed.

EMBODIMENT OF THE INVENTION The 1st Embodiment of this invention is described with reference to FIG.

The surge absorber 1 according to the present embodiment is a discharge type surge absorber using a trigger gap. This surge absorber 1 is a rectangular parallelepiped as a whole, and as shown in Fig. 1, a pair of oppositely arranged terminal electrode members 2 and 3 and these terminal electrode members 2 and 3 are arranged at both ends. The insulating ceramic insulator tube 4 sealed inside with gas, such as argon (Ar), and the protruding electrodes 5 and 6 provided in the terminal electrode members 2 and 3, respectively, are comprised.

The pair of terminal electrode members 2 and 3 are made of Kovar (registered trademark), which is an alloy of nickel (Ni), cobalt (Co), and iron (Fe), or an alloy of nickel (Ni) and iron (Fe). It consists of 42 alloys, etc., and is formed in the rectangular flat plate.

On the other hand, the ceramic insulator tube 4 is made of ceramics such as alumina (Al ₂ O ₃ ), and has a rectangular frame-shaped cross section whose outer circumference corresponds to the outer circumference of the terminal electrode members 2 and 3. On both end surfaces of the ceramic insulator tube 4, a metallization layer 7 having a two-layer structure of a molybdenum (Mo) -tungsten (W) alloy layer and a nickel (Ni) layer is provided. The ceramic insulator tube 4 has a pair of terminal electrode members 2 and 3 at the end face provided with the metallization layer 7 through a silver (Ag) copper (Cu) -based solder material 8. Is blocked, and argon gas is sealed inside the ceramic insulator tube 4.

On the inner surface of the pair of terminal electrode members 2 and 3, the protruding electrodes 5 and 6 are slightly shifted from the center of the terminal electrode members 2 and 3, respectively, and further to the center of the ceramic insulator tube 4. It protrudes along the axis 101 direction of the ceramic insulator tube 4 from the point symmetrical position with respect to the ceramic insulator tube 4 inside. The length of these protruding electrodes 5 and 6 is slightly longer than half of the distance between a pair of terminal electrode members 2 and 3. Further, these protruding electrodes 5 and 6 are made of titanium (Ti), nickel (Ni) or an alloy of nickel (Ni) and iron (Fe), and the like, and are fixed by welding to the terminal electrode members 2 and 3 by welding. It is. The protruding electrode 5 and the protruding electrode 6 form a trigger gap 51.

Next, the manufacturing method of the surge absorber 1 of this embodiment which consists of the above structure is demonstrated.

First, the pair of terminal electrode members 2 and 3 and the protruding electrodes 5 and 6 are formed. Then, the protruding electrode 5 is fixed to the position of the terminal electrode member 2 slightly shifted from the center of the terminal electrode member 2 by welding.

Further, the protruding electrode 6 is welded to the terminal electrode member 3 by welding so that the protruding electrode 5 fixed to the terminal electrode member 2 is in a point symmetrical position with respect to the center of the ceramic insulator tube 4. Stick.

Here, the protruding electrode 5 and the protruding electrode 6 are arranged so as to be a distance from which a desired discharge start voltage is obtained.

Next, the molybdenum (Mo) -tungsten (W) alloy layer and the nickel (Ni) layer are formed in this order on both end faces of the ceramic insulator tube 4, and the wettability with the frame-shaped solder material 8 is improved. The metallization layer 7 for this purpose is formed.

Then, a solid solder material 8 is provided on the terminal electrode member 2 to which the protruding electrode 5 is fixed, and a ceramic insulator tube 4 is provided on the periphery of the terminal electrode member 2. In addition, the brazing material 8 is mounted on the ceramic insulator tube 4, and the terminal electrode member 3 on which the protruding electrode 6 is fixed is mounted thereon and temporarily assembled.

After sufficiently evacuating in the temporarily assembled state in this manner, the tube is heated in a sealed gas atmosphere, the frame brazing material 8 is melted and sealed, and then rapidly cooled to manufacture the surge absorber 1.

The surge absorber 1 thus manufactured is used by soldering and fixing the land formed on the printed board or the like and the outer surfaces of the pair of terminal electrode members 2 and 3 of the surge absorber 1.

When a surge voltage is applied to the surge absorber 1 having such a configuration, first, a discharge occurs in the trigger gap 51 of the surge absorber 1, and argon ionized by the discharge in the trigger gap 51 ( Main discharge is induced by Ar). By relief of a surge voltage by this main discharge, the electronic device in which the surge absorber 1 is provided can be protected from the damage by a surge voltage.

According to the surge absorber 1, the pair of protruding electrodes 5 and 6 fixed to the pair of terminal electrode members 2 and 3 without changing the lengths of the pair of protruding electrodes 5 and 6, respectively. By changing the position, the distance of the trigger gap 51 can be changed. Therefore, the discharge start voltage can be changed based on the same electrode material, sealing gas, and sealing gas pressure.

Next, the surge absorber 11 according to the second embodiment of the present invention will be described with reference to FIG. In addition, in the following description, the same code | symbol is attached | subjected to the component demonstrated in the said 1st Embodiment, and the description is abbreviate | omitted.

The second embodiment differs from the first embodiment in that, as shown in FIG. 2, the length of the pair of protruding electrodes 5, 6 is the distance between the pair of terminal electrode members 2, 3. It is formed a little shorter than half of.

According to the surge absorber 11, the distance of the trigger gap 52 is changed by changing the position of fixing to the pair of terminal electrode members 2 and 3 without changing the length of the pair of protruding electrodes 5 and 6. Can be changed, and the same effect as in the first embodiment can be obtained. In addition, by bringing the protruding electrode 5 and the protruding electrode 6 closer to the shaft 101 of the ceramic insulator tube, the distance of the trigger gap 52 between the pair of the protruding electrodes 5 and 6 is extremely extreme. Even if it is made short, there is no possibility that the protruding electrode 5 and the protruding electrode 6 come into contact with each other due to the attraction force generated between the pair of protruding electrodes 5 and 6 during discharge.

In the above first and second embodiments, the length of the pair of protruding electrodes 5, 6 is longer than half of the distance between the pair of terminal electrode members 2, 3 in the surge absorber 1. In the surge absorber 11, although it is formed shorter than half of the distance between the pair of terminal electrode members 2 and 3, as shown in FIG. The length may be exactly half the distance. Also in the case of the surge absorber 21 shown in Fig. 3, the pair of protruding electrodes 5, 6 is connected to the pair of terminal electrode members 2, even if the length of the pair of protruding electrodes 5, 6 is not changed. The distance of the trigger gap 53 can be changed by changing the position to adhere to 3). Further, even when the distance of the trigger gap 53 is made extremely short, the protruding electrode 5 and the protruding electrode 6 come into contact with each other by the attraction force generated between the two protruding electrodes 5 and 6 during discharge. Since there is little possibility of discarding, the effect similar to 2nd Embodiment can be acquired.

Next, a third embodiment according to the present invention will be described with reference to FIG. In addition, in the following description, the same code | symbol is attached | subjected to the component demonstrated in the said 1st and 2nd embodiment, and the description is abbreviate | omitted.

The difference between the surge absorber 31 of the third embodiment and the first or second embodiment is that the pair of protruding electrodes 5 and 6 are formed in a spiral shape as shown in FIG. .

In the surge absorber 31, the protruding electrodes 5, 6 spirally extending toward the other terminal electrode members 3, 2 on the inner surfaces of the pair of terminal electrode members 2, 3, It is fixed so that it may become point symmetric with respect to the center of the ceramic mix insulator tube 4. The distal end of the protruding electrode 5 and the distal end of the protruding electrode 6 serve as discharge portions 32, and the gap between these discharge portions 32 forms a trigger gap 54.

The surge absorber 31 of this embodiment is manufactured in the same procedure as the surge absorber 1 of the first embodiment.

Here, the protruding electrode 5 and the protruding electrode 6 are arranged so that the distance between each discharge part 32 becomes a distance from which a desired discharge start voltage is obtained.

According to this surge absorber 31, the distance of the trigger gap 54 is changed by changing the position where it adheres to a terminal electrode member, without changing the distance from the front end part to the base end part of a pair of spiral protruding electrodes 5 and 6. Since it can change, the effect similar to 1st Embodiment can be acquired. Moreover, according to this surge absorber 31, even if the brazing material 8 etc. of sealing material flowed to the root part of the spiral protruding electrodes 5 and 6, the root part of the spiral protruding electrodes 5 and 6 is carried out. Since the distance from the discharge portion 32 to the discharge portion 32 can be greatly increased, the discharge starting voltage due to the brazing material 8 reaching the discharge portion 32 due to the surface tension and the material of the discharge portion 32 changed. It can prevent the change.

In addition, in the embodiment shown above, although the pair of protruding electrodes 5 and 6 are fixed to the pair of terminal electrode members 2 and 3 so as to be point symmetrical with respect to the center of the ceramic insulator tube 4, The center of the point symmetry of the pair of protruding electrodes 5, 6 is not limited to the center of the ceramic insulator tube 4, but is on the surface including the center of the ceramic insulator tube 4 perpendicular to the axis 101. You may shift from the center of the insulator tube 4.

Further, the pair of protruding electrodes 5 and 6 is not limited to columnar or spiral shapes such as thin circular columns and respective columns, and may have a shape of reducing the inner diameter of the outer circumference toward the tip portion such as a triangular pyramid shape, and further punching processing. It may be a shape as shown in Fig. 5 in which the metal flat plate produced in the form is rounded in a columnar shape. The protruding electrode 41 shown in Fig. 5 punches a metal plate such as thin titanium (Ti) in a T-shape, rounds the horizontal portion 42 corresponding to the T-shaped horizontal bar in a circumferential shape, and then forms a T-shape. The vertical portion 43 corresponding to the vertical bar of is pressed and formed in the center direction of the horizontal portion 42 rounded in a column shape. In this case, the edge part of the horizontal part 42 rounded at the columnar shape is used by being fixed to the terminal electrode member 2 and the terminal electrode member 3 by welding or the like. In the protruding electrode 41, the protruding electrode 41 can be produced only by punching and bending a metal plate, so that the protruding electrode 41 can be produced at a lower cost than the columnar, horn or spiral electrode.

In addition, in the embodiment shown above, although the protrusion electrodes 5 and 6 are fixed by welding to the pair of terminal electrode members 2 and 3 by welding, they are not limited to welding and are shown in FIG. As shown in Fig. 6, a small hole 71 is drilled through the terminal electrode members 2 and 3 (the terminal electrode member 3 in Figs. 6A to 6E), and the process (b) of Fig. 6 is performed. As shown, even if the proximal ends of the protruding electrodes 5 and 6 (the protruding electrodes 6 in Figs. 6A to 6E) are press-fitted into the holes 71 and then fixed with a solder material, good. In addition, the press-in of the protruding electrode 6 is also press-fitted to penetrate the terminal electrode member 3 as shown in step (c) of FIG. 6, and then, as shown in step (d) of FIG. 6. By pressing the end portion 72 of the protruding electrode 6 penetrating from the terminal electrode member 3, it is fixed to the terminal electrode member 3, or of the protruding electrode 6 penetrating from the terminal electrode member 3. Only the end portion 72 is pressed and then the terminal electrode member 3 and the protruding electrode 6 are fixed by pressing so as to be bent relative to the terminal electrode member 3 as shown in step (e) of FIG. You may integrate it. By doing in this way, the terminal electrode member 3 and the protruding electrode 6 can be fixed more stably.

In addition, the method of fixing the protruding electrodes 5 and 6 to the terminal electrode members 2 and 3 may be a method by caulking shown in Figs. 7A to 7C. That is, as shown in the step (a) of FIG. 7, the protruding electrodes 5 and 6 (in FIGS. 7A to 7C) are formed in the holes 71 of the terminal electrode members 2 and 3. Only the terminal electrode member 3 and the protruding electrode 6] are press-fitted, and then a cylindrical punch P having an inner diameter larger than that of the protruding electrode 6 is used for the hole of the terminal electrode member 3. The periphery of 71 is pressed and the punch P is made to penetrate into the terminal electrode member 3, as shown to the process (b) of FIG. By pressing this punch P, the thickness of the terminal electrode member 3 inward from the press site | part is pushed up radially inward as shown by the arrow to the process (b) of FIG. The corrugation part 73 firmly fixes the protruding electrode 6 to the terminal electrode member 3, as shown in the process (c) of FIG. 7, while reducing the diameter of the hole 71. FIG.

As described above, when the protruding electrodes 5 and 6 are firmly fixed to the terminal electrode members 2 and 3 by caulking, the protruding electrodes 5 may be affected by thermal shock such as repeated discharge or shock such as vibration from the outside. And 6) are not bent or the protruding electrodes 5 and 6 fixed from the terminal electrode members 2 and 3 do not fall out, and a change in the discharge distance can be prevented.

The material of the protruding electrode may be Fe, Cu, Mo, Mn, W, Ag, Al, Pd, Pt, or two or more of these alloys, in addition to Ti, Ni, and Fe—Ni alloys. In addition, on the surface of the above-mentioned protruding electrode, SnO ₂ , SiC, ITO, TiC, TiCN, BaAl ₄ or the conductive film of the metal or alloy described above may be formed by sputtering or the like.

In this case, when the outer surface of the protruding electrode is formed of a metal containing silver (Ag), the response can be further improved.

8 shows a surge absorber in which a conductive film containing silver is formed on the outer surface of the protruding electrode. In the surge absorber 81, the conductive film 82 formed on the protruding electrodes 5 and 6 is formed by the brazing material 8 which fixes the insulating tube 4 and the terminal electrode members 2 and 3. When the silver (Ag) -copper (Cu) brazing material is used as the brazing material 8 and the brazing material 8 is melted, the protruding electrodes 5 and 6 are subjected to surface tension. By climbing, the conductive coating 82 is formed on the outer surfaces of the protruding electrodes 5 and 6.

In the case of manufacturing this surge absorber 81, a brazing material is formed by punching the proximal ends of the protruding electrodes 5 and 6 into the terminal electrode members 2 and 3 and inserting the protruding electrodes 5 and 6 therethrough. A sheet (not shown) is made to penetrate the protruding electrodes 5 and 6 to cover the terminal electrode members 2 and 3, and then an insulating tube 4 is disposed thereon, and both ends of the insulating tube 4 are disposed. Both terminal electrode members 2 and 3 are disposed through the brazing material sheet. When these are heated in an assembled state to melt the brazing material 8, the insulating tube 4 is fixed between the terminal electrode members 2 and 3, and the terminal electrode members 2 and 3 are subjected to surface tension. The brazing material on the surface crawls up the protruding electrodes 5 and 6 to cover the outer surfaces of the protruding electrodes 5 and 6 to form a conductive coating 82.

In order to compare the response characteristics between the surge absorber 81 configured as described above and the surge absorber without such a conductive coating 82, the impulse becomes 10 Hz, the maximum value at 1.2 microseconds, and the half value at 50 microseconds. The response voltage (discharge start voltage) when the voltage was applied was measured. As shown in Fig. 9, it is understood that the surge absorber having the conductive coating has a lower response voltage and a smaller variation in the response voltage, and thus excellent response characteristics.

By covering the outer surfaces of the protruding electrodes 5 and 6 with the conductive coating 82 containing silver, the responsiveness can be greatly improved, and in particular, even when a steep surge is applied, the discharge start voltage rises. This is suppressed and a stable discharge start voltage can be obtained.

Next, a fourth embodiment of the surge absorber of the present invention will be described with reference to the drawings.

10 is a longitudinal sectional view of a surge absorber according to a fourth embodiment of the present invention.

In this surge absorber S1, a pair of lead wires 202a and 202b made of a conductive wire such as a ducted wire (copper-coated iron nickel alloy wire) is kept on a base 201 made of an electrical insulating material to maintain a predetermined gap. The Ag alloy is made of Ag (silver) or Ag (silver) -Cu (copper) or the like at the tip end side (upper side in Fig. 10) of each lead wire 202a, 202b. Rod-shaped discharge electrodes 203a and 203b of a predetermined length are provided in parallel with each other with a gap of the discharge gap G. In other words, in the surge absorber S1 of the present embodiment, the rod-shaped discharge electrodes 203a and 203b made of Ag or Ag alloy are further fixed to the tip ends of the lead wires 202a and 202b.

In addition, an airtight container member 204 made of glass or the like is fixed to the base 201 so as to surround the discharge electrodes 203a and 203b. In the airtight container C surrounded by the airtight container member 204 and the base 201, rare gases such as argon (Ar), neon (Ne), helium (He), xenon (Xe), nitrogen gas, and the like. The discharge gas (sealing gas) which consists of inert gas of this is filled.

In the surge absorber S1 having the above configuration, the lead wires 202a and 202b are connected between the lines of the device to be protected, for example, between the lines of the electronic device. When a surge is applied to the line, an air discharge is generated between the discharge electrodes 203a and 203b, the surge is absorbed, and the electronic device is protected from the surge. In this surge absorber S1, the discharge electrodes 203a and 203b are formed in a rod shape, are arranged in parallel with each other, and the inward side surface F, which is in an opposing state, becomes a discharge surface. Since the discharge electrode 203a is secured in a relatively large area extending in the longitudinal direction of the discharge electrodes 203a and 203b, the discharge is performed between the discharge electrodes 203a and 203b of this large area, and the surge is absorbed, so that a stable discharge start voltage can be obtained. .

During the discharge of the air, since the discharge electrodes 203a and 203b are made of stable Ag or Ag alloy of the discharge start voltage, even when the start voltage of the discharge is performed within a predetermined stable range and a steep surge is applied. The discharge start voltage does not increase, the function as a surge absorber can be assured, and a more stable discharge start voltage can be obtained. In addition, even if a part of the surface of the discharge electrodes 203a and 203b scatters due to repetitive discharge, a stable discharge start voltage can be obtained in the long term.

11 is a longitudinal sectional view of a surge absorber according to a fifth embodiment of the present invention. In the figure, the same code | symbol is attached | subjected to the element common to the said 4th Embodiment, and description is simplified.

In this surge absorber S2, the discharge electrodes 205a and 205b respectively connected to the tip end sides of the pair of lead wires 202a and 202b each have a film of a predetermined length made of Fe, Ni, Cu, or an alloy thereof. In addition to the large base shafts 206a and 206b, coating layers 207a and 207b made of Ag or Ag alloy are formed on all of the base shafts 206a and 206b.

In this case, the lead wires 202a and 202b can be extended to be a base axis without using the bar-shaped base axes 206a and 206b and the lead wires 202a and 202b as separate members.

The Ag coating layers 207a and 207b on the base shafts 206a and 206b can be easily formed by performing Ag plating on the base shafts 206a and 206b. It is also possible to form the surface of the base shafts 206a and 206b by a printing method or by sputtering.

Also in the surge absorber S2 having the above configuration, since the outer surfaces of the discharge electrodes 205a and 205b are made of Ag or Ag alloy with stable discharge start voltage, the discharge start voltage is within a stable range within a predetermined range. Even when a steep surge is applied, the discharge start voltage does not increase, and the function as a surge absorber can be assured. Further, since Ag coating layers 207a and 207b are provided on the entire surfaces of the discharge electrodes 205a and 205b, a more stable discharge start voltage can be obtained in a large area, and a stable discharge start voltage can be obtained in the long term.

12 and 13 are longitudinal sectional views of a surge absorber according to a sixth embodiment of the present invention.

In this surge absorber S3, the discharge electrodes 208a and 208b respectively connected to the tip end sides of the pair of lead wires 202a and 202b each have a film of a predetermined length made of Fe, Ni, Cu, or an alloy thereof. Ag or Ag alloy is formed only on the inward side face F which has the large base shafts 209a and 209b and is in an opposing state through the discharge gap G among the outer surfaces of these base shafts 209a and 209b. Coating layers 210a and 210b are formed. 12 and 13, coating layers 210a and 210b are formed on the side surfaces of the discharge electrodes 208a and 208b at approximately half circumference. Also in this case, as the structure of the rod-shaped base shafts 209a and 209b, the lead wires 202a and 202b can be extended to be a base shaft.

Also in the surge absorber S3 having the above-described configuration, since the discharged part of the discharge electrodes 208a and 208b is made of Ag or an Ag alloy in which the discharge start voltage is stable, the start voltage of the discharge is within a predetermined range. Even if a steep surge is applied within a stable range, the discharge start voltage does not increase, and the function as a surge absorber can be assured. In addition, since expensive Ag is coated only on the inward side of approximately half the circumference of the discharge electrodes 208a and 208b, the entire discharge electrodes 208a and 208b can be manufactured inexpensively compared with the case of forming Ag material. .

(Example)

The surge absorber of the fourth embodiment was measured while comparing the discharge characteristics thereof with metals other than Ag.

Fig. 14 is a graph showing the response voltage characteristics when the material of the discharge electrode is Ag, Ni, Cu, or Fe. As the surge voltage, an impulse voltage was set at 10 microseconds which is the maximum value at 1.2 microseconds and its half value at 50 microseconds. The discharge start voltage at that time was measured as a response voltage. In Fig. 14, the response voltages are shown side by side for each material.

As is apparent from Fig. 14, in the case of the discharge electrode made of Ag according to the present invention, the response voltage (discharge voltage) is lower than that of the discharge electrode of other materials, and the width of the fluctuation is also small, and the stable high accuracy is achieved. It can be seen that the discharge start voltage is obtained.

In addition, the technical scope of this invention is not limited to the said embodiment, It is possible to add various changes in the range which does not deviate from the meaning of this invention. That is, the present invention is not limited by the above description and is only limited by the scope of the attached claims.

For example, the pair of terminal electrode members 2 and 3 in the first to third embodiments may be Cu or an Ni-based alloy.

The metallization layer 7 on both end faces of the ceramic insulator tube 4 may be Ag, Cu, Au, or Mo-Mn, and a brazing material made of an active metal without using the metallization layer 7 ( 8) may be sealed.

The sealing gas may be atmospheric (air), for example, whose composition is adjusted to obtain the desired electrical properties, and Ar, N ₂ , Ne, He, Xe, H ₂ , SF ₆ , C ₂ F ₆ , C ₃ F ₈ , CO ₂ , and the like, and a mixed gas thereof.

In addition, in the case of forming the conductive coating on the protruding electrode, a method such as plating, printing, sputtering or the like can be employed in addition to the method described above with the brazing material.

In the fourth to sixth embodiments, for example, the discharge electrode may be composed of an Ag single member, may be composed of an Ag alloy, or may be made more inexpensive if it is composed of an Ag alloy. In addition, not only the case where the discharge electrode itself is comprised by Ag or Ag alloy, or when the coating layer of Ag or Ag alloy is formed on the surface of a discharge electrode, the discharge electrode should just contain Ag or Ag alloy, for example, For example, it may consist of a mixture with other metals or insulators.

In addition, in the example of each said embodiment, it is set as the structure which forms the airtight container C which accommodates a discharge electrode in the base 201 and the airtight container member 204, but if the discharge electrode can be kept in parallel, one It is also possible to form a hermetic container by narrowing the both ends of the cylindrical container made of a glass cylinder or the like while melting.

According to the present invention, a surge absorber capable of easily changing the distance between discharge electrodes without changing the length of the discharge electrode can be provided.

Claims (10)

A surge absorber having an insulating tube for disposing a pair of terminal electrode members at both ends and sealing gas therein, A pair of projecting electrodes protruding toward the other terminal electrode member is fixed to an inner surface of the pair of terminal electrode members, A surge absorber in which the pair of protruding electrodes are arranged to be offset from each other. The surge absorber according to claim 1, wherein the pair of protruding electrodes are disposed at a point symmetrical with respect to the center of the insulating tube. The surge absorber according to claim 1, wherein a distance from the leading end to the proximal end of the pair of protruding electrodes is equal to or less than half of the distance between the pair of electrode members. The surge absorber according to claim 1, wherein the protruding electrode is helically formed. The surge absorber according to claim 1, wherein a film containing silver is formed on an outer surface of the protruding electrode. The surge absorber according to claim 1, wherein the protruding electrode is fixed by caulking the proximal end in a hole formed in the terminal electrode member. A pair of rod-shaped discharge electrodes in a mill container are surge absorbers arranged in parallel with each other while maintaining a predetermined discharge gap. And a Ag or Ag alloy in the material of the inward side facing at least through the discharge gap of the pair of discharge electrodes. 8. The surge absorber according to claim 7, wherein the entire surface of the pair of discharge electrodes is made of Ag or Ag alloy. 8. The surge absorber according to claim 7, wherein the pair of discharge electrodes is made of Ag or Ag alloy. 8. The surge absorber according to claim 7, wherein a coating layer made of Ag or Ag alloy is formed on the pair of discharge electrodes.

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